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Technical Measures to Improve HBT60 Concrete Pump
The original HBT60 gate valve concrete pump suffered from several technical limitations, including low power output, insufficient outlet pressure, outdated structural design, and long-term wear due to extended usage. These issues led to poor efficiency, frequent component replacements, and an inability to meet modern construction demands. As a result, it was necessary to enhance the pump's performance parameters and improve its structural design, leading to the development of the upgraded HBT60G model.
To improve pumping performance, the design parameters were aligned with those of similar models. The original HBT60 was equipped with a main pump A7VO160, operating at 28MPa system pressure, with a main cylinder bore of φ80mm, a delivery cylinder of φ195mm, and a stroke length of 1400mm. It used a Y250M-4 motor with 55kW power and 1480rpm speed, resulting in a concrete outlet pressure of 4.7MPa and a delivery capacity of 50m³/h. However, these parameters were below industry standards. After upgrading, the HBT60G featured a dual-pump system using A8VO107, maintaining the same 28MPa system pressure but increasing the main cylinder bore to φ100mm, while keeping the delivery cylinder and stroke unchanged. The motor was upgraded to Y280S-4 with 75kW and 1480rpm, raising the outlet pressure to 7.36MPa and the delivery capacity to 65m³/h, significantly improving overall performance.
The performance curves of HBT60 and HBT60G demonstrate these improvements. At an outlet pressure of 2.5MPa, the HBT60G can deliver 62m³/h, compared to only 45m³/h for the HBT60. Additionally, the maximum outlet pressure of the HBT60G reaches 7.36MPa, allowing it to pump 37m³/h, which is nearly double the capacity of the HBT60 at the same pressure. This means that the HBT60G can handle longer pumping distances or greater heights efficiently.
Furthermore, when operating under the same conditions, the HBT60G maintains lower system pressure than the HBT60, enhancing reliability and reducing stress on hydraulic components. For instance, at an outlet pressure of 3MPa, the HBT60G operates at 11.5MPa, while the HBT60 reaches 18MPa, showing a clear advantage in system stability.
In addition to performance upgrades, the HBT60G also features significant structural and configuration improvements to increase machine reliability:
1. The hydraulic system was enhanced by replacing the gear pump with a dual-gear pump for the mixing and cleaning circuits, making them independent and increasing the pressure of the stirring and washing systems, thereby reducing the load on the main system.
2. The mixing drive system was simplified by directly connecting the motor to the drive shaft, reducing failure points and improving mechanical efficiency.
3. The spool valve cylinder assembly was improved with added buffer systems and piston guide sleeves, extending the service life of the cylinder.
4. The electrical control system was upgraded with additional protection mechanisms, ensuring more stable and safer operation.
Overall, after the comprehensive upgrade, the HBT60G demonstrates a significant improvement in performance and reliability, meeting the growing demands of modern construction projects. Its practical application has proven effective, offering a qualitative leap in functionality compared to previous models.